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Abstract

This article describes a mechanism to dynamically alter the I/O control data in a data processing system, required by the I/O subsystem, without having to re-initialize the complete system. The system control program will be running with one set of I/O control data, when it is desired to alter the data. (New or additional I/O has been added.) The initial build of the system area which is the location of the I/O control data is built such that the area will always be larger than required. This will allow a new level of I/O control data to be loaded in the same area of the running level with additional control data getting into the previously set-aside extra space.

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United States

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English (United States)

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Dynamic Refresh of I/O Control Data

This article describes a mechanism to dynamically alter the I/O control data in a
data processing system, required by the I/O subsystem, without having to re-
initialize the complete system. The system control program will be running with
one set of I/O control data, when it is desired to alter the data. (New or additional
I/O has been added.) The initial build of the system area which is the location of
the I/O control data is built such that the area will always be larger than required.
This will allow a new level of I/O control data to be loaded in the same area of the
running level with additional control data getting into the previously set-aside
extra space. A new command executed by the control program to the service
processor instructs the service processor to idle the system so as to load in a
new load of I/O control data as specified by the command. The system is idled,
the new load is placed in the system area, the channel hardware is reset, and the
processor and channels are restarted.